MIC280_14 Datasheet, PDF (1/28 Pages) Micrel Semiconductor – Precision IttyBitty™ Thermal Supervisor

MIC280
Precision IttyBitty™ Thermal Supervisor
General Description
The MIC280 is a digital thermal supervisor capable of
measuring its own internal temperature and that of a
remote PN junction. The remote junction may be an
inexpensive commodity transistor—e.g., 2N3906—or an
embedded thermal diode such as those found in Intel
Pentium^® II/III/IV CPUs, AMD Athlon^® CPUs, and Xilinx
Virtex^® FPGAs. A 2-wire SMBus^® 2.0-compatible serial
interface is provided for host communication. Remote
temperature is measured with ±1°C accuracy and 9-bit to
12-bit resolution (programmable). Independent high, low,
and overtemperature thresholds are provided for each
zone.
The advanced integrating A/D converter and analog front-
end reduce errors due to noise for maximum accuracy and
minimum guardbanding. The interrupt output signals
temperature events to the host, including data-ready and
diode faults. Critical device settings can be locked to
prevent changes and ensure failsafe operation. The clock,
data, and interrupt pins are 5V-tolerant regardless of the
value of V_DD. They will not clamp the bus lines low even if
the device is powered down. Superior accuracy, failsafe
operation, and small size make the MIC280 an excellent
choice for the most demanding thermal management
applications.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Features
 Measures local and remote temperature
 Highly accurate remote sensing: ±1°C max., 60°C to
100°C
 Superior noise immunity for reduced temperature
guardbands
 9-bit to 12-bit temperature resolution for remote zone
 Fault queues to further reduce nuisance tripping
 Programmable high, low, and overtemperature
thresholds for each zone
 SMBus 2.0-compatible serial interface including device
timeout to prevent bus lockup
 Voltage-tolerant I/Os
 Open-drain interrupt output pin – supports SMBus Alert
Response Address protocol
 Low power shutdown mode
 Locking of critical functions to ensure failsafe operation
 Failsafe response to diode faults
 Enables ACPI-compliant thermal management
 3.0V to 3.6V power supply range
 Available in IttyBitty™ SOT23-6 package
Applications
 Desktop, server, and notebook computers
 Printers and copiers
 Test and measurement equipment
 Thermal supervision of Xilinx Virtex FPGAs
 Wireless/RF systems
 Intelligent power supplies
 Datacom/telecom cards
Typical Application
IttyBitty is a trademark of Micrel, Inc. All other trademarks are the property of their respective owners.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
May 5, 2014
Revision 2.0